Emissions control

Catalytic converters

1 in 3

Cleaner air

20 million tonnes

of pollutants stopped in their tracks each year

We're pioneers in the field of emission controls, having made the first commercial emission control catalysts in 1974.

As world leaders in the technology, we've been working for more than forty years to help make the world's air cleaner, creating ever-more sophisticated systems to remove pollutants from a wide range of sources.

Market applications

More than 90% of new passenger vehicles - cars, vans and light trucks - are now fitted with catalysts, one third of which have been supplied by Johnson Matthey.

Three-way catalyst (TWC)

Gasoline or petrol fuelled vehicles typically use a three-way catalyst (TWC), so-called because it converts three pollutants:

Carbon monoxide (CO)

Hydrocarbons (HC)

Oxides of nitrogen (NOx)

- to carbon dioxide, water and nitrogen.

Conversion rates of over 90% are possible.

Diesel oxidation catalyst (DOC)

Diesel engines require a diesel oxidation catalyst (DOC) to remove CO and HC and can also reduce particulate matter (PM) by up to 50%.

With emissions legislation now affecting many of the world's motorcycle markets, Johnson Matthey is ideally placed to supply the catalysts. We recognise the value of working with our customers to produce the best overall catalyst and vehicle configuration.

Our testing facilities

We evaluate vehicles at our state-of-the-art testing facilities and review the results with manufacturers in comprehensive catalyst development and application programmes.

Based on a greater understanding of the chemical processes specific to motorcycle pollutant conversion, Johnson Matthey has developed a new generation of highly durable catalyst formulations and novel catalyst substrates for motorcycles.

Johnson Matthey offers a number of emissions reduction systems that can be fitted to diesel vehicles and machinery already in service.

The wide variety of applications, markets, legislation and fuel quality around the world means that the range of products available is tailored for different markets worldwide.

Johnson Matthey offers products and technologies for the reduction of emissions from trucks and buses to engine and vehicle OEMs. Our world-leading catalyst technologies are tailored to individual requirements, supported by extensive laboratory and bench-engine testing facilities, computer-modelling capabilities and proven manufacturing expertise.

We also offer a range of diesel retrofit solutions for the owners and operators of vehicles already in service.

Johnson Matthey works with engine and equipment manufacturers to provide emissions control systems for all non-road mobile applications.

Non-road mobile machinery for OEMs

Johnson Matthey works with engine and equipment manufacturers to provide emissions control systems for all non-road mobile applications.

Our engineering experience and catalyst expertise enable us to provide solutions for a wide range of requirements from a few systems for special applications to standard fit components for regulatory emissions compliance.

Non-road mobile machinery for machines already in use

Johnson Matthey is a world leader in the manufacture of catalysts and catalytic emission control systems to reduce air pollution from stationary and non-road sources of emissions. Our air pollution solutions include:

Oxidation catalysts and catalytic converters for control of CO and VOCs from industry and power generation

Three-way catalysts and catalytic converters for control of NOx, CO and VOCs from rich-burn engines

SCR catalysts and systems for control of NOx from coal-fired power plants, waste incineration facilities, manufacturing plants, engines and turbines, and marine power sources

Diesel particulate filter systems for control of diesel PM from stationary engines and non-road machines

There is a Johnson Matthey catalytic solution to control air pollution from almost every stationary emission source for cleaner industry, cleaner energy and cleaner air.